The present invention provides a pressing structure of a soap dispenser for adjusting an output amount of the soap by adjusting the distance of a pressing stroke thereof. The pressing structure includes a rejecting member, a driving device, and a moving member, wherein the driving device is connected to the moving member through a transmission mechanism, and the rejecting member includes a connecting portion linked with the moving member, and a pressing plate against a pressing head of a liquid container, characterized in that the rejecting member further includes a retractable portion used for adjusting the vertical distance between the connecting portion and the pressing plate. Accordingly, through adjusting the vertical distance by the retractable portion, the vertical moving distance of a pressing head of a liquid container achieved by the pressing plate can therefore be decided, so as to output a suitable amount of soap.